Question

So basically, I have something like this –
Input file with 2 integers.
Code, something like this –

#include <iostream>
#include <fstream>
using namespace std;
int main() {
  unsigned long long n, k;
  ifstream input_file("file.txt");
  input_file >> n >> k;
  if(n >= 10^9 || k >= 10^9) {
    cout << "0" << endl;
  }
  return 0;
}

So, is there any chance to check if any of theese two integers are bigger than 10^9? Basically, if I assign thoose integers to unsigned long long, and if they are bigger than 10^9, they automatically turn to some random value, that fits inside unsigned long long, am I right, and that means that there is no chance to check it, or am I’m missing something?

Answer 1

On most platforms, an unsigned long long will be able to store 10⁹ with no problem. You just need to say:

if (n >= 1000000000ull)

If an unsigned long long is 64-bits, for example, which is common, you can store up to 2⁶⁴